The 5 Limestone Tennis Shoe Friendly Feet work well as large footholds for beginners on vertical and low-angle walls. Set #1 can also be used without footwear since it has a smoother texture with less rock-like material.
The more advanced climber can use these as large, steep wall feet.
The advanced climber can use these as small handholds on low-angle terrain. The limestone-like texture on the holds allows climbers to find sweet spots, making them usable for the hands as well.
On a vertical wall, expect V2. On a 45-degree wall, expect V7+.